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Mathematics 21 Online
OpenStudy (anonymous):

The average of nine numbers is 9. When a tenth number is added, the average of the ten numbers is also 9. What is the tenth number? A) 0 B) 9/10 C) 10/9 D) 9 E) 10 Thanks! :)

OpenStudy (anonymous):

9

OpenStudy (anonymous):

Thanks!

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